1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
5 \\ / A nd | Copyright (C) 1991-2008 OpenCFD Ltd.
7 -------------------------------------------------------------------------------
9 This file is part of OpenFOAM.
11 OpenFOAM is free software; you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation; either version 2 of the License, or (at your
14 option) any later version.
16 OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 You should have received a copy of the GNU General Public License
22 along with OpenFOAM; if not, write to the Free Software Foundation,
23 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
29 Calculates and writes the flowType of velocity field U.
30 The -noWrite option has no meaning.
32 The flow type parameter is obtained according to the following equation:
35 lambda = -------------
40 1 = planar extensional flow
43 \*---------------------------------------------------------------------------*/
48 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
50 void Foam::calc(const argList& args, const Time& runTime, const fvMesh& mesh)
60 if (Uheader.headerOk())
62 Info<< " Reading U" << endl;
63 volVectorField U(Uheader, mesh);
65 volTensorField gradU = fvc::grad(U);
66 volScalarField magD = mag(symm(gradU));
67 volScalarField magOmega = mag(skew(gradU));
68 dimensionedScalar smallMagD("smallMagD", magD.dimensions(), SMALL);
70 Info<< " Calculating flowType" << endl;
72 volScalarField flowType
81 (magD - magOmega)/(magD + magOmega + smallMagD)
88 Info<< " No U" << endl;
93 // ************************************************************************* //